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Recursive and non-recursive algorithm binary tree preorder, preorder and post-order traversal, and the level traversal algorithms. Binary Tree is represented by algebraic expressions, each node of the tree, including an operational tree algebraic expression contains " +" , " -" , " *" , " /" , and an integer without error, according to the first multiplication and division principles of construction of binary addition and subtraction. Construct a Huffman tree, the output of the corresponding Huffman coding and the average length.